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根据川口C4+5油层温度、压力及流体性质,通过室内PVT实验和长岩心驱油实验,研究了CO2对地层原油饱和压力、相对体积、原油粘度的影响规律,评价了CO2的注入方式和驱油效率。研究认为:CO2具有很强的膨胀地层原油、大幅度降低地层油粘度,更好地改善原油性质,增加原油流动能力,CO2驱油不仅可以解决特低渗透油藏注不进水的问题,而且可以有效地补充地层能量,有效提高油井产能,提高采收率。
According to the temperature, pressure and fluid properties of the Kawaguchi C4 +5 oil reservoir, the effects of CO2 on the saturation pressure, relative volume and crude oil viscosity of the formation were studied by PVT experiments and long core oil displacement experiments. The CO2 injection method and flooding Oil efficiency. The study shows that: CO2 has a strong expansion of the formation of crude oil, greatly reducing the viscosity of formation oil to better improve the nature of crude oil and increase the ability of crude oil flow, CO2 flooding can not only solve the problem of ultra-low permeability reservoirs not water, and It can effectively replenish formation energy, effectively improve oil well productivity and increase oil recovery.